package org.jenkinsci.plugins.pipeline.modeldefinition.ast;

import hudson.model.Describable;
import hudson.model.Descriptor;
import net.sf.json.JSONObject;
import org.jenkinsci.plugins.pipeline.modeldefinition.DescriptorLookupCache;
import org.jenkinsci.plugins.pipeline.modeldefinition.validator.ModelValidator;
import org.jenkinsci.plugins.structs.describable.DescribableModel;
import org.jenkinsci.plugins.structs.describable.DescribableParameter;
import org.kohsuke.accmod.Restricted;
import org.kohsuke.accmod.restrictions.NoExternalUse;

import edu.umd.cs.findbugs.annotations.NonNull;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * Represents an individual step within any of the various blocks that can contain steps.
 *
 * @author Kohsuke Kawaguchi
 * @author Andrew Bayer
 */
public class ModelASTStep extends ModelASTElement {
    /**
     * @deprecated since 1.2-beta-4
     */
    @Deprecated
    @Restricted(NoExternalUse.class)
    public static Map<String, String> blockedStepsBase() {
        LinkedHashMap<String, String> map = new LinkedHashMap<>();
        map.put("stage", Messages.ModelASTStep_BlockedSteps_Stage());
        map.put("properties", Messages.ModelASTStep_BlockedSteps_Properties());
        map.put("parallel", Messages.ModelASTStep_BlockedSteps_Parallel());
        return map;
    }

    /**
     * Use {@code org.jenkinsci.plugins.pipeline.modeldefinition.validator.BlockedStepsAndMethodCalls.blockedInSteps()} instead.
     *
     * @deprecated since 1.2-beta-4
     */
    @Deprecated
    @Restricted(NoExternalUse.class)
    public static Map<String, String> getBlockedSteps() {
        return blockedStepsBase();
    }

    private String name;
    private ModelASTArgumentList args;

    public ModelASTStep(Object sourceLocation) {
        super(sourceLocation);
    }

    @Override
    @NonNull
    public JSONObject toJSON() {
        return new JSONObject()
                .accumulate("name", name)
                .elementOpt("arguments", toJSON(args));
    }

    @Override
    public void validate(@NonNull ModelValidator validator) {
        validator.validateElement(this);
        validate(validator, args);
    }

    @Override
    @NonNull
    public String toGroovy() {
        // Default to using whatever the original args structure is.
        ModelASTArgumentList argList = args;

        // If the args aren't null and they're a named list...
        if (args != null && args instanceof ModelASTNamedArgumentList) {
            ModelASTNamedArgumentList namedArgs = (ModelASTNamedArgumentList) args;
            // If the named list is exactly 1 long...
            if (namedArgs.getArguments().size() == 1) {
                DescriptorLookupCache lookup = DescriptorLookupCache.getPublicCache();
                Descriptor<? extends Describable> desc = lookup.lookupStepFirstThenFunction(name);
                DescribableModel<? extends Describable> model = lookup.modelForStepFirstThenFunction(name);

                // If we can lookup the model for this step or function...
                if (model != null) {
                    DescribableParameter p = model.getSoleRequiredParameter();
                    // If it's got a sole required parameter, that parameter is the key in our named list, and it doesn't
                    // take a closure...
                    if (p != null && namedArgs.containsKeyName(p.getName()) && !lookup.stepTakesClosure(desc)) {
                        ModelASTValue value = namedArgs.valueForName(p.getName());

                        // Set the arg list to instead be a ModelASTSingleArgument of that value.
                        argList = new ModelASTSingleArgument(null);
                        ((ModelASTSingleArgument) argList).setValue(value);
                    }
                }
            }
        }

        return withOrWithoutParens(argList);
    }

    private String withOrWithoutParens(ModelASTArgumentList argList) {
        if (argList == null) {
            return name + "()";
        } else {
            String argGroovy = argList.toGroovy();
            if (!(this instanceof ModelASTTreeStep) &&
                    argList instanceof ModelASTSingleArgument &&
                    // Special-casing for list/map args since they still need parentheses.
                    !argGroovy.startsWith("[")) {
                return name + " " + argGroovy;
            } else {
                return name + "(" + argGroovy + ")";
            }
        }
    }

    @Override
    public void removeSourceLocation() {
        super.removeSourceLocation();
        removeSourceLocationsFrom(args);
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public ModelASTArgumentList getArgs() {
        return args;
    }

    public void setArgs(ModelASTArgumentList args) {
        this.args = args;
    }

    @Override
    public String toString() {
        return "ModelASTStep{" +
                "name='" + name + '\'' +
                ", args=" + args +
                "}";
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        if (!super.equals(o)) {
            return false;
        }

        ModelASTStep that = (ModelASTStep) o;

        if (getName() != null ? !getName().equals(that.getName()) : that.getName() != null) {
            return false;
        }
        return getArgs() != null ? getArgs().equals(that.getArgs()) : that.getArgs() == null;

    }

    @Override
    public int hashCode() {
        int result = super.hashCode();
        result = 31 * result + (getName() != null ? getName().hashCode() : 0);
        result = 31 * result + (getArgs() != null ? getArgs().hashCode() : 0);
        return result;
    }
}
